Observation of extremely strong shock waves in solids launched by petawatt laser heating

PHYSICS OF PLASMAS 24 (2017) ARTN 083115

KL Lancaster, APL Robinson, J Pasley, P Hakel, T Ma, K Highbarger, FN Beg, SN Chen, RL Daskalova, RR Freeman, JS Green, H Habara, P Jaanimagi, MH Key, J King, R Kodama, K Krushelnick, H Nakamura, M Nakatsutsumi, AJ MacKinnon, AG MacPhee, RB Stephens, L Van Woerkom, PA Norreys

Attosecond-scale absorption at extreme intensities

PHYSICS OF PLASMAS 24 (2017) ARTN 113103

AF Savin, AJ Ross, M Serzans, RMGM Trines, L Ceurvorst, N Ratan, B Spiers, R Bingham, APL Robinson, PA Norreys

Scattering length monitoring at the SNO plus detector


S Langrock, J Lidgard, E Turner, L Segui, A Reichold, JR Wilson, IOP, SNO Collaboration

Brilliant X-rays using a Two-Stage Plasma Insertion Device.

Scientific reports 7 (2017) 3985-

JA Holloway, PA Norreys, AGR Thomas, R Bartolini, R Bingham, J Nydell, RMGM Trines, R Walker, M Wing

Particle accelerators have made an enormous impact in all fields of natural sciences, from elementary particle physics, to the imaging of proteins and the development of new pharmaceuticals. Modern light sources have advanced many fields by providing extraordinarily bright, short X-ray pulses. Here we present a novel numerical study, demonstrating that existing third generation light sources can significantly enhance the brightness and photon energy of their X-ray pulses by undulating their beams within plasma wakefields. This study shows that a three order of magnitude increase in X-ray brightness and over an order of magnitude increase in X-ray photon energy is achieved by passing a 3 GeV electron beam through a two-stage plasma insertion device. The production mechanism micro-bunches the electron beam and ensures the pulses are radially polarised on creation. We also demonstrate that the micro-bunched electron beam is itself an effective wakefield driver that can potentially accelerate a witness electron beam up to 6 GeV.

Dense plasma heating by crossing relativistic electron beams.

Physical review. E 95 (2017) 013211-

N Ratan, NJ Sircombe, L Ceurvorst, J Sadler, MF Kasim, J Holloway, MC Levy, R Trines, R Bingham, PA Norreys

Here we investigate, using relativistic fluid theory and Vlasov-Maxwell simulations, the local heating of a dense plasma by two crossing electron beams. Heating occurs as an instability of the electron beams drives Langmuir waves, which couple nonlinearly into damped ion-acoustic waves. Simulations show a factor 2.8 increase in electron kinetic energy with a coupling efficiency of 18%. Our results support applications to the production of warm dense matter and as a driver for inertial fusion plasmas.

Nonlinear parametric resonance of relativistic electrons with a linearly polarized laser pulse in a plasma channel

Physics of Plasmas 24 (2017)

TW Huang, CT Zhou, APL Robinson, B Qiao, AV Arefiev, PA Norreys, XT He, SC Ruan

© 2017 Author(s). The direct laser-acceleration mechanism, nonlinear parametric resonance, of relativistic electrons in a linearly polarized laser-produced plasma channel is examined by a self-consistent model including the relativistic laser dispersion in plasmas. Nonlinear parametric resonance can be excited, and the oscillation amplitude of electrons grows exponentially when the betatron frequency of electron motion varies roughly twice the natural frequency of the oscillator. It is shown analytically that the region of parametric resonance is defined by the self-similar parameter n e /n c a 0 . The width of this region decreases with n e /n c a 0 , but the energy gain and oscillation amplitude increases. In this regime, the electron transverse momentum grows faster than that in the linear classical resonance regime.

Excitation and Control of Plasma Wakefields by Multiple Laser Pulses


J Cowley, C Thornton, C Arran, RJ Shalloo, L Corner, G Cheung, CD Gregory, SPD Mangles, NH Matlis, DR Symes, R Walczak, SM Hooker

Machine learning applied to proton radiography of high-energy-density plasmas.

Physical review. E 95 (2017) 043305-

NFY Chen, MF Kasim, L Ceurvorst, N Ratan, J Sadler, MC Levy, R Trines, R Bingham, P Norreys

Proton radiography is a technique extensively used to resolve magnetic field structures in high-energy-density plasmas, revealing a whole variety of interesting phenomena such as magnetic reconnection and collisionless shocks found in astrophysical systems. Existing methods of analyzing proton radiographs give mostly qualitative results or specific quantitative parameters, such as magnetic field strength, and recent work showed that the line-integrated transverse magnetic field can be reconstructed in specific regimes where many simplifying assumptions were needed. Using artificial neural networks, we demonstrate for the first time 3D reconstruction of magnetic fields in the nonlinear regime, an improvement over existing methods, which reconstruct only in 2D and in the linear regime. A proof of concept is presented here, with mean reconstruction errors of less than 5% even after introducing noise. We demonstrate that over the long term, this approach is more computationally efficient compared to other techniques. We also highlight the need for proton tomography because (i) certain field structures cannot be reconstructed from a single radiograph and (ii) errors can be further reduced when reconstruction is performed on radiographs generated by proton beams fired in different directions.

The Coherent Combination of Fibre Lasers - Towards Realistic Applications


P Tudor, L Corner, R Walczak, AIP

Quantitative shadowgraphy and proton radiography for large intensity modulations.

Physical review. E 95 (2017) 023306-

MF Kasim, L Ceurvorst, N Ratan, J Sadler, N Chen, A Sävert, R Trines, R Bingham, PN Burrows, MC Kaluza, P Norreys

Shadowgraphy is a technique widely used to diagnose objects or systems in various fields in physics and engineering. In shadowgraphy, an optical beam is deflected by the object and then the intensity modulation is captured on a screen placed some distance away. However, retrieving quantitative information from the shadowgrams themselves is a challenging task because of the nonlinear nature of the process. Here, we present a method to retrieve quantitative information from shadowgrams, based on computational geometry. This process can also be applied to proton radiography for electric and magnetic field diagnosis in high-energy-density plasmas and has been benchmarked using a toroidal magnetic field as the object, among others. It is shown that the method can accurately retrieve quantitative parameters with error bars less than 10%, even when caustics are present. The method is also shown to be robust enough to process real experimental results with simple pre- and postprocessing techniques. This adds a powerful tool for research in various fields in engineering and physics for both techniques.

Absolute multilateration between spheres


J Muelaner, W Wadsworth, M Azini, G Mullineux, B Hughes, A Reichold

Optimization of plasma amplifiers.

Physical review. E 95 (2017) 053211-

JD Sadler, RMGM Trines, M Tabak, D Haberberger, DH Froula, AS Davies, S Bucht, LO Silva, EP Alves, F Fiúza, L Ceurvorst, N Ratan, MF Kasim, R Bingham, PA Norreys

Plasma amplifiers offer a route to side-step limitations on chirped pulse amplification and generate laser pulses at the power frontier. They compress long pulses by transferring energy to a shorter pulse via the Raman or Brillouin instabilities. We present an extensive kinetic numerical study of the three-dimensional parameter space for the Raman case. Further particle-in-cell simulations find the optimal seed pulse parameters for experimentally relevant constraints. The high-efficiency self-similar behavior is observed only for seeds shorter than the linear Raman growth time. A test case similar to an upcoming experiment at the Laboratory for Laser Energetics is found to maintain good transverse coherence and high-energy efficiency. Effective compression of a 10kJ, nanosecond-long driver pulse is also demonstrated in a 15-cm-long amplifier.

Robustness of raman plasma amplifiers and their potential for attosecond pulse generation


JD Sadler, M Sliwa, T Miller, MF Kasim, N Ratan, L Ceurvorst, A Savin, R Aboushelbaya, PA Norreys, D Haberberger, AS Davies, S Bucht, DH Froula, J Vieira, RA Fonseca, LO Silva, R Bingham, K Glize, RMGM Trines

High flux, beamed neutron sources employing deuteron-rich ion beams from D<inf>2</inf>O-ice layered targets

Plasma Physics and Controlled Fusion 59 (2017)

A Alejo, AG Krygier, H Ahmed, JT Morrison, RJ Clarke, J Fuchs, A Green, JS Green, D Jung, A Kleinschmidt, Z Najmudin, H Nakamura, P Norreys, M Notley, M Oliver, M Roth, L Vassura, M Zepf, M Borghesi, RR Freeman, S Kar

© 2017 IOP Publishing Ltd. A forwardly-peaked bright neutron source was produced using a laser-driven, deuteron-rich ion beam in a pitcher-catcher scenario. A proton-free ion source was produced via target normal sheath acceleration from Au foils having a thin layer of D 2 O ice at the rear side, irradiated by sub-petawatt laser pulses (∼200 J, ∼750 fs) at peak intensity . The neutrons were preferentially produced in a beam of ∼70 FWHM cone along the ion beam forward direction, with maximum energy up to ∼40 MeV and a peak flux along the axis for neutron energy above 2.5 MeV. The experimental data is in good agreement with the simulations carried out for the d(d,n) 3 He reaction using the deuteron beam produced by the ice-layered target.

Measurement of event-shape observables in [Formula: see text] events in pp collisions at [Formula: see text] [Formula: see text] with the ATLAS detector at the LHC.

The European physical journal. C, Particles and fields 76 (2016) 375-

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Antos, F Anulli, M Aoki, L Aperio Bella, G Arabidze, Y Arai, JP Araque, ATH Arce, FA Arduh, J-F Arguin, S Argyropoulos, M Arik, AJ Armbruster, LJ Armitage, O Arnaez, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Artz, S Asai, N Asbah, A Ashkenazi, B Åsman, L Asquith, K Assamagan, R Astalos, M Atkinson, NB Atlay, K Augsten, G Avolio, B Axen, MK Ayoub, G Azuelos, MA Baak, AE Baas, MJ Baca, H Bachacou, K Bachas, M Backes, M Backhaus, P Bagiacchi, P Bagnaia, Y Bai, JT Baines, OK Baker, EM Baldin, P Balek, T Balestri, F Balli, WK Balunas, E Banas, S Banerjee, AAE Bannoura, L Barak, EL Barberio, D Barberis, M Barbero, T Barillari, M Barisonzi, T Barklow, N Barlow, SL Barnes, BM Barnett, RM Barnett, Z Barnovska, A Baroncelli, G Barone, AJ Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimarães da Costa, R Bartoldus, AE Barton, P Bartos, A Basalaev, A Bassalat, A Basye, RL Bates, SJ Batista, JR Batley, M Battaglia, M Bauce, F Bauer, HS Bawa, JB Beacham, MD Beattie, T Beau, PH 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Black, KM Black, D Blackburn, RE Blair, J-B Blanchard, JE Blanco, T Blazek, I Bloch, C Blocker, W Blum, U Blumenschein, S Blunier, GJ Bobbink, VS Bobrovnikov, SS Bocchetta, A Bocci, C Bock, M Boehler, D Boerner, JA Bogaerts, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, T Bold, V Boldea, AS Boldyrev, M Bomben, M Bona, M Boonekamp, A Borisov, G Borissov, J Bortfeldt, D Bortoletto, V Bortolotto, K Bos, D Boscherini, M Bosman, JD Bossio Sola, J Boudreau, J Bouffard, EV Bouhova-Thacker, D Boumediene, C Bourdarios, SK Boutle, A Boveia, J Boyd, IR Boyko, J Bracinik, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, WD Breaden Madden, K Brendlinger, AJ Brennan, L Brenner, R Brenner, S Bressler, TM Bristow, D Britton, D Britzger, FM Brochu, I Brock, R Brock, G Brooijmans, T Brooks, WK Brooks, J Brosamer, E Brost, JH Broughton, PA Bruckman de Renstrom, D Bruncko, R Bruneliere, A Bruni, G Bruni, BH Brunt, M Bruschi, N Bruscino, P Bryant, L Bryngemark, T Buanes, Q Buat, P Buchholz, AG Buckley, IA Budagov, F Buehrer, MK Bugge, O Bulekov, D Bullock, H Burckhart, S Burdin, CD Burgard, B Burghgrave, K Burka, S Burke, I Burmeister, E Busato, D Büscher, V Büscher, P Bussey, JM Butler, AI Butt, CM Buttar, JM Butterworth, P Butti, W Buttinger, A Buzatu, AR Buzykaev, S Cabrera Urbán, D Caforio, VM Cairo, O Cakir, N Calace, P Calafiura, A Calandri, G Calderini, P Calfayan, LP Caloba, D Calvet, S Calvet, TP Calvet, R Camacho Toro, S Camarda, P Camarri, D Cameron, R Caminal Armadans, C Camincher, S Campana, M Campanelli, A Campoverde, V Canale, A Canepa, M Cano Bret, J Cantero, R Cantrill, T Cao, MDM Capeans Garrido, I Caprini, M Caprini, M Capua, R Caputo, RM Carbone, R Cardarelli, F Cardillo, T Carli, G Carlino, L Carminati, S Caron, E Carquin, GD Carrillo-Montoya, JR Carter, J Carvalho, D Casadei, MP Casado, M Casolino, DW Casper, E Castaneda-Miranda, A Castelli, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, A Cattai, J Caudron, V Cavaliere, E Cavallaro, D Cavalli, M Cavalli-Sforza, V Cavasinni, F Ceradini, L Cerda Alberich, BC Cerio, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, M Cerv, A Cervelli, SA Cetin, A Chafaq, D Chakraborty, I Chalupkova, SK Chan, YL Chan, P Chang, JD Chapman, DG Charlton, A Chatterjee, CC Chau, CA Chavez Barajas, S Che, S Cheatham, A Chegwidden, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, H Chen, K Chen, S Chen, S Chen, X Chen, Y Chen, HC Cheng, HJ Cheng, Y Cheng, A Cheplakov, E Cheremushkina, R Cherkaoui El Moursli, V Chernyatin, E Cheu, L Chevalier, V Chiarella, G Chiarelli, G Chiodini, AS Chisholm, A Chitan, MV Chizhov, K Choi, AR Chomont, S Chouridou, BKB Chow, V Christodoulou, D Chromek-Burckhart, J Chudoba, AJ Chuinard, JJ Chwastowski, L Chytka, G Ciapetti, AK Ciftci, D Cinca, V Cindro, IA Cioara, A Ciocio, F Cirotto, ZH Citron, M Ciubancan, A Clark, BL Clark, MR Clark, PJ Clark, RN Clarke, C Clement, Y Coadou, M Cobal, A Coccaro, J Cochran, L Coffey, L Colasurdo, B Cole, S Cole, AP Colijn, J Collot, T Colombo, G Compostella, P Conde Muiño, E Coniavitis, SH Connell, IA Connelly, V Consorti, S Constantinescu, C Conta, G Conti, F Conventi, M Cooke, BD Cooper, AM Cooper-Sarkar, T Cornelissen, M Corradi, F Corriveau, A Corso-Radu, A Cortes-Gonzalez, G Cortiana, G Costa, MJ Costa, D Costanzo, G Cottin, G Cowan, BE Cox, K Cranmer, SJ Crawley, G Cree, S Crépé-Renaudin, F Crescioli, WA Cribbs, M Crispin Ortuzar, M Cristinziani, V Croft, G Crosetti, T Cuhadar Donszelmann, J Cummings, M Curatolo, J Cúth, C Cuthbert, H Czirr, P Czodrowski, S D'Auria, M D'Onofrio, MJ Da Cunha Sargedas De Sousa, C Da Via, W Dabrowski, T Dai, O Dale, F Dallaire, C Dallapiccola, M Dam, JR Dandoy, NP Dang, AC Daniells, NS Dann, M Danninger, M Dano Hoffmann, V Dao, G Darbo, S Darmora, J Dassoulas, A Dattagupta, W Davey, C David, T Davidek, M Davies, P Davison, Y Davygora, E Dawe, I Dawson, RK Daya-Ishmukhametova, K De, R de Asmundis, A De Benedetti, S De Castro, S De Cecco, N De Groot, P de Jong, H De la Torre, F De Lorenzi, D De Pedis, A De Salvo, U De Sanctis, A De Santo, JB De Vivie De Regie, WJ Dearnaley, R Debbe, C Debenedetti, DV Dedovich, I Deigaard, J Del Peso, T Del Prete, D Delgove, F Deliot, CM Delitzsch, M Deliyergiyev, A Dell'Acqua, L Dell'Asta, M Dell'Orso, M Della Pietra, D Della Volpe, M Delmastro, PA Delsart, C Deluca, DA DeMarco, S Demers, M Demichev, A Demilly, SP Denisov, D Denysiuk, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, C Deterre, K Dette, PO Deviveiros, A Dewhurst, S Dhaliwal, A Di Ciaccio, L Di Ciaccio, WK Di Clemente, A Di Domenico, C Di Donato, A Di Girolamo, B Di Girolamo, A Di Mattia, B Di Micco, R Di Nardo, A Di Simone, R Di Sipio, D Di Valentino, C Diaconu, M Diamond, FA Dias, MA Diaz, EB Diehl, J Dietrich, S Diglio, A Dimitrievska, J Dingfelder, P Dita, S Dita, F Dittus, F Djama, T Djobava, JI Djuvsland, MAB do Vale, D Dobos, M Dobre, C Doglioni, T Dohmae, J Dolejsi, Z Dolezal, BA Dolgoshein, M Donadelli, S Donati, P Dondero, J Donini, J Dopke, A Doria, MT Dova, AT Doyle, E Drechsler, M Dris, Y Du, J Duarte-Campderros, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, L Duflot, L Duguid, M Dührssen, M Dunford, H Duran Yildiz, M Düren, A Durglishvili, D Duschinger, B Dutta, M Dyndal, C Eckardt, KM Ecker, RC Edgar, W Edson, NC Edwards, T Eifert, G Eigen, K Einsweiler, T Ekelof, M El Kacimi, V Ellajosyula, M Ellert, S Elles, F Ellinghaus, AA Elliot, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, Y Enari, OC Endner, M Endo, JS Ennis, J Erdmann, A Ereditato, G Ernis, J Ernst, M Ernst, S Errede, E Ertel, M Escalier, H Esch, C Escobar, B Esposito, AI Etienvre, E Etzion, H Evans, A Ezhilov, F Fabbri, L Fabbri, G Facini, RM Fakhrutdinov, S Falciano, RJ Falla, J Faltova, Y Fang, M Fanti, A Farbin, A Farilla, C Farina, T Farooque, S Farrell, SM Farrington, P Farthouat, F Fassi, P Fassnacht, D Fassouliotis, M Faucci Giannelli, A Favareto, WJ Fawcett, L Fayard, OL Fedin, W Fedorko, S Feigl, L Feligioni, C Feng, EJ Feng, H Feng, AB Fenyuk, L Feremenga, P Fernandez Martinez, S Fernandez Perez, J Ferrando, A Ferrari, P Ferrari, R Ferrari, DE Ferreira de Lima, A Ferrer, D Ferrere, C Ferretti, A Ferretto Parodi, F Fiedler, A Filipčič, M Filipuzzi, F Filthaut, M Fincke-Keeler, KD Finelli, MCN Fiolhais, L Fiorini, A Firan, A Fischer, C Fischer, J Fischer, WC Fisher, N Flaschel, I Fleck, P Fleischmann, GT Fletcher, G Fletcher, RRM Fletcher, T Flick, A Floderus, LR Flores Castillo, MJ Flowerdew, GT Forcolin, A Formica, A Forti, AG Foster, D Fournier, H Fox, S Fracchia, P Francavilla, M Franchini, D Francis, L Franconi, M Franklin, M Frate, M Fraternali, D Freeborn, SM Fressard-Batraneanu, F Friedrich, D Froidevaux, JA Frost, C Fukunaga, E Fullana Torregrosa, T Fusayasu, J Fuster, C Gabaldon, O Gabizon, A Gabrielli, A Gabrielli, GP Gach, S Gadatsch, S Gadomski, G Gagliardi, LG Gagnon, P Gagnon, C Galea, B Galhardo, EJ Gallas, BJ Gallop, P Gallus, G Galster, KK Gan, J Gao, Y Gao, YS Gao, FM Garay Walls, C García, JE García Navarro, M Garcia-Sciveres, RW Gardner, N Garelli, V Garonne, A Gascon Bravo, C Gatti, A Gaudiello, G Gaudio, B Gaur, L Gauthier, IL Gavrilenko, C Gay, G Gaycken, EN Gazis, Z Gecse, CNP Gee, C Geich-Gimbel, MP Geisler, C Gemme, MH Genest, C Geng, S Gentile, S George, D Gerbaudo, A Gershon, S Ghasemi, H Ghazlane, M Ghneimat, B Giacobbe, S Giagu, P Giannetti, B Gibbard, SM Gibson, M Gignac, M Gilchriese, TPS Gillam, D Gillberg, G Gilles, DM Gingrich, N Giokaris, MP Giordani, FM Giorgi, FM Giorgi, PF Giraud, P Giromini, D Giugni, F Giuli, C Giuliani, M Giulini, BK Gjelsten, S Gkaitatzis, I Gkialas, EL Gkougkousis, LK Gladilin, C Glasman, J Glatzer, PCF Glaysher, A Glazov, M Goblirsch-Kolb, J Godlewski, S Goldfarb, T Golling, D Golubkov, A Gomes, R Gonçalo, J Goncalves Pinto Firmino Da Costa, L Gonella, A Gongadze, S González de la Hoz, G Gonzalez Parra, S Gonzalez-Sevilla, L Goossens, PA Gorbounov, HA Gordon, I Gorelov, B Gorini, E Gorini, A Gorišek, E Gornicki, AT Goshaw, C Gössling, MI Gostkin, CR Goudet, D Goujdami, AG Goussiou, N Govender, E Gozani, L Graber, I Grabowska-Bold, POJ Gradin, P Grafström, J Gramling, E Gramstad, S Grancagnolo, V Gratchev, HM Gray, E Graziani, ZD Greenwood, C Grefe, K Gregersen, IM Gregor, P Grenier, K Grevtsov, J Griffiths, AA Grillo, K Grimm, S Grinstein, P Gris, J-F Grivaz, S Groh, JP Grohs, E Gross, J Grosse-Knetter, GC Grossi, ZJ Grout, L Guan, W Guan, J Guenther, F Guescini, D Guest, O Gueta, E Guido, T Guillemin, S Guindon, U Gul, C Gumpert, J Guo, Y Guo, S Gupta, G Gustavino, P Gutierrez, NG Gutierrez Ortiz, C Gutschow, C Guyot, C Gwenlan, CB Gwilliam, A Haas, C Haber, HK Hadavand, N Haddad, A Hadef, P Haefner, S Hageböck, Z Hajduk, H Hakobyan, M Haleem, J Haley, D Hall, G Halladjian, GD Hallewell, K Hamacher, P Hamal, K Hamano, A Hamilton, GN Hamity, PG Hamnett, L Han, K Hanagaki, K Hanawa, M Hance, B Haney, P Hanke, R Hanna, JB Hansen, JD Hansen, MC Hansen, PH Hansen, K Hara, AS Hard, T Harenberg, F 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Thomas-Wilsker, EN Thompson, PD Thompson, RJ Thompson, AS Thompson, LA Thomsen, E Thomson, M Thomson, MJ Tibbetts, RE Ticse Torres, VO Tikhomirov, YA Tikhonov, S Timoshenko, P Tipton, S Tisserant, K Todome, T Todorov, S Todorova-Nova, J Tojo, S Tokár, K Tokushuku, E Tolley, L Tomlinson, M Tomoto, L Tompkins, K Toms, B Tong, E Torrence, H Torres, E Torró Pastor, J Toth, F Touchard, DR Tovey, T Trefzger, L Tremblet, A Tricoli, IM Trigger, S Trincaz-Duvoid, MF Tripiana, W Trischuk, B Trocmé, A Trofymov, C Troncon, M Trottier-McDonald, M Trovatelli, L Truong, M Trzebinski, A Trzupek, JC-L Tseng, PV Tsiareshka, G Tsipolitis, N Tsirintanis, S Tsiskaridze, V Tsiskaridze, EG Tskhadadze, KM Tsui, II Tsukerman, V Tsulaia, S Tsuno, D Tsybychev, A Tudorache, V Tudorache, AN Tuna, SA Tupputi, S Turchikhin, D Turecek, D Turgeman, R Turra, AJ Turvey, PM Tuts, M Tyndel, G Ucchielli, I Ueda, R Ueno, M Ughetto, F Ukegawa, G Unal, A Undrus, G Unel, FC Ungaro, Y Unno, C Unverdorben, J Urban, P Urquijo, P Urrejola, G Usai, A Usanova, L Vacavant, V Vacek, B Vachon, C Valderanis, E Valdes Santurio, N Valencic, S Valentinetti, A Valero, L Valery, S Valkar, S Vallecorsa, JA Valls Ferrer, W Van Den Wollenberg, PC Van Der Deijl, R van der Geer, H van der Graaf, N van Eldik, P van Gemmeren, J Van Nieuwkoop, I van Vulpen, MC van Woerden, M Vanadia, W Vandelli, R Vanguri, A Vaniachine, P Vankov, G Vardanyan, R Vari, EW Varnes, T Varol, D Varouchas, A Vartapetian, KE Varvell, JG Vasquez, F Vazeille, T Vazquez Schroeder, J Veatch, LM Veloce, F Veloso, S Veneziano, A Ventura, M Venturi, N Venturi, A Venturini, V Vercesi, M Verducci, W Verkerke, JC Vermeulen, A Vest, MC Vetterli, O Viazlo, I Vichou, T Vickey, OE Vickey Boeriu, GHA Viehhauser, S Viel, L Vigani, R Vigne, M Villa, M Villaplana Perez, E Vilucchi, MG Vincter, VB Vinogradov, C Vittori, I Vivarelli, S Vlachos, M Vlasak, M Vogel, P Vokac, G Volpi, M Volpi, H von der Schmitt, E von Toerne, V Vorobel, K Vorobev, M Vos, R Voss, JH Vossebeld, N Vranjes, M Vranjes Milosavljevic, V Vrba, M Vreeswijk, R Vuillermet, I Vukotic, Z Vykydal, P Wagner, W Wagner, H Wahlberg, S Wahrmund, J Wakabayashi, J Walder, R Walker, W Walkowiak, V Wallangen, C Wang, C Wang, F Wang, H Wang, H Wang, J Wang, J Wang, K Wang, R Wang, SM Wang, T Wang, T Wang, X Wang, C Wanotayaroj, A Warburton, CP Ward, DR Wardrope, A Washbrook, PM Watkins, AT Watson, IJ Watson, MF Watson, G Watts, S Watts, BM Waugh, S Webb, MS Weber, SW Weber, JS Webster, AR Weidberg, B Weinert, J Weingarten, C Weiser, H Weits, PS Wells, T Wenaus, T Wengler, S Wenig, N Wermes, M Werner, P Werner, M Wessels, J Wetter, K Whalen, NL Whallon, AM Wharton, A White, MJ White, R White, S White, D Whiteson, FJ Wickens, W Wiedenmann, M Wielers, P Wienemann, C Wiglesworth, LAM Wiik-Fuchs, A Wildauer, F Wilk, HG Wilkens, HH Williams, S Williams, C Willis, S Willocq, JA Wilson, I Wingerter-Seez, F Winklmeier, OJ Winston, BT Winter, M Wittgen, J Wittkowski, SJ Wollstadt, MW Wolter, H Wolters, BK Wosiek, J Wotschack, MJ Woudstra, KW Wozniak, M Wu, M Wu, SL Wu, X Wu, Y Wu, TR Wyatt, BM Wynne, S Xella, D Xu, L Xu, B Yabsley, S Yacoob, R Yakabe, D Yamaguchi, Y Yamaguchi, A Yamamoto, S Yamamoto, T Yamanaka, K Yamauchi, Y Yamazaki, Z Yan, H Yang, H Yang, Y Yang, Z Yang, W-M Yao, YC Yap, Y Yasu, E Yatsenko, KH Yau Wong, J Ye, S Ye, I Yeletskikh, AL Yen, E Yildirim, K Yorita, R Yoshida, K Yoshihara, C Young, CJS Young, S Youssef, DR Yu, J Yu, JM Yu, J Yu, L Yuan, SPY Yuen, I Yusuff, B Zabinski, R Zaidan, AM Zaitsev, N Zakharchuk, J Zalieckas, A Zaman, S Zambito, L Zanello, D Zanzi, C Zeitnitz, M Zeman, A Zemla, JC Zeng, Q Zeng, K Zengel, O Zenin, T Ženiš, D Zerwas, D Zhang, F Zhang, G Zhang, H Zhang, J Zhang, L Zhang, R Zhang, R Zhang, X Zhang, Z Zhang, X Zhao, Y Zhao, Z Zhao, A Zhemchugov, J Zhong, B Zhou, C Zhou, L Zhou, L Zhou, M Zhou, N Zhou, CG Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, A Zibell, D Zieminska, NI Zimine, C Zimmermann, S Zimmermann, Z Zinonos, M Zinser, M Ziolkowski, L Živković, G Zobernig, A Zoccoli, M Zur Nedden, G Zurzolo, L Zwalinski

Event-shape observables measured using charged particles in inclusive Z-boson events are presented, using the electron and muon decay modes of the Z bosons. The measurements are based on an integrated luminosity of [Formula: see text] of proton-proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy [Formula: see text] [Formula: see text]. Charged-particle distributions, excluding the lepton-antilepton pair from the Z-boson decay, are measured in different ranges of transverse momentum of the Z boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and [Formula: see text]-parameter, which are in particular sensitive to properties of the underlying event at small values of the Z-boson transverse momentum. The measured observables are compared with predictions from Pythia 8, Sherpa, and Herwig 7. Typically, all three Monte Carlo generators provide predictions that are in better agreement with the data at high Z-boson transverse momenta than at low Z-boson transverse momenta, and for the observables that are less sensitive to the number of charged particles in the event.

High Orbital Angular Momentum Harmonic Generation

Physical Review Letters 117 (2016)

J Vieira, RMGM Trines, EP Alves, RA Fonseca, JT Mendonça, R Bingham, P Norreys, LO Silva

© 2016 American Physical Society. We identify and explore a high orbital angular momentum (OAM) harmonics generation and amplification mechanism that manipulates the OAM independently of any other laser property, by preserving the initial laser wavelength, through stimulated Raman backscattering in a plasma. The high OAM harmonics spectra can extend at least up to the limiting value imposed by the paraxial approximation. We show with theory and particle-in-cell simulations that the orders of the OAM harmonics can be tuned according to a selection rule that depends on the initial OAM of the interacting waves. We illustrate the high OAM harmonics generation in a plasma using several examples including the generation of prime OAM harmonics. The process can also be realized in any nonlinear optical Kerr media supporting three-wave interactions.

Scaled laboratory experiments explain the kink behaviour of the Crab Nebula jet.

Nature communications 7 (2016) 13081-

CK Li, P Tzeferacos, D Lamb, G Gregori, PA Norreys, MJ Rosenberg, RK Follett, DH Froula, M Koenig, FH Seguin, JA Frenje, HG Rinderknecht, H Sio, AB Zylstra, RD Petrasso, PA Amendt, HS Park, BA Remington, DD Ryutov, SC Wilks, R Betti, A Frank, SX Hu, TC Sangster, P Hartigan, RP Drake, CC Kuranz, SV Lebedev, NC Woolsey

The remarkable discovery by the Chandra X-ray observatory that the Crab nebula's jet periodically changes direction provides a challenge to our understanding of astrophysical jet dynamics. It has been suggested that this phenomenon may be the consequence of magnetic fields and magnetohydrodynamic instabilities, but experimental demonstration in a controlled laboratory environment has remained elusive. Here we report experiments that use high-power lasers to create a plasma jet that can be directly compared with the Crab jet through well-defined physical scaling laws. The jet generates its own embedded toroidal magnetic fields; as it moves, plasma instabilities result in multiple deflections of the propagation direction, mimicking the kink behaviour of the Crab jet. The experiment is modelled with three-dimensional numerical simulations that show exactly how the instability develops and results in changes of direction of the jet.

Current Status and Future Prospects of the SNO plus Experiment


S Andringa, E Arushanova, S Asahi, M Askins, DJ Auty, AR Back, Z Barnard, N Barros, EW Beier, A Bialek, SD Biller, E Blucher, R Bonventre, D Braid, E Caden, E Callaghan, J Caravaca, J Carvalho, L Cavalli, D Chauhan, M Chen, O Chkvorets, K Clark, B Cleveland, IT Coulter, D Cressy, X Dai, C Darrach, B Davis-Purcell, R Deen, MM Depatie, F Descamps, F Di Lodovico, N Duhaime, F Duncan, J Dunger, E Falk, N Fatemighomi, R Ford, P Gorel, C Grant, S Grullon, E Guillian, AL Hallin, D Hallman, S Hans, J Hartnell, P Harvey, M Hedayatipour, WJ Heintzelman, RL Helmer, B Hreljac, J Hu, Iida, CM Jackson, NA Jelley, C Jillings, C Jones, PG Jones, K Kamdin, T Kaptanoglu, J Kaspar, P Keener, P Khaghani, L Kippenbrock, JR Klein, R Knapik, JN Kofron, LL Kormos, S Korte, C Kraus, CB Krauss, K Labe, I Lam, C Lan, BJ Land, S Langrock, A LaTorre, I Lawson, GM Lefeuvre, EJ Leming, J Lidgard, X Liu, Y Liu, V Lozza, S Maguire, A Maio, K Majumdar, S Manecki, J Maneira, E Marzec, A Mastbaum, N McCauley, AB McDonald, JE McMillan, P Mekarski, C Miller, Y Mohan, E Mony, MJ Mottram, V Novikov, HM O'Keeffe, E O'Sullivan, GDO Gann, J Parnell, SJM Peeters, T Pershing, Z Petriw, G Prior, JC Prouty, S Quirk, A Reichold, A Robertson, J Rose, R Rosero, PM Rost, J Rumleskie, MA Schumaker, MH Schwendener, D Scislowski, J Secrest, M Seddighin, L Segui, S Seibert, T Shantz, TM Shokair, L Sibley, JR Sinclair, K Singh, P Skensved, A Soerensen, T Sonley, R Stainforth, M Strait, MI Stringer, R Svoboda, J Tatar, L Tian, N Tolich, J Tseng, HWC Tseung, R Van Berg, E Vzquez-Jauregui, C Virtue, B von Krosigk, JMG Walker, M Walker, O Wasalski, J Waterfield, RF White, JR Wilson, TJ Winchester, A Wright, M Yeh, T Zhao, K Zuber

Secondary wavelength stabilization of unbalanced Michelson interferometers for the generation of low-jitter pulse trains.

Optics letters 41 (2016) 4068-4070

RJ Shalloo, L Corner

We present a double unbalanced Michelson interferometer producing up to four output pulses from a single input pulse. The interferometer is stabilized with the Hänsch-Couillaud method using an auxiliary low power continuous wave laser injected into the interferometer, allowing the stabilization of the temporal jitter of the output pulses to 0.02 fs. Such stabilized pulse trains would be suitable for driving multi-pulse laser wakefield accelerators, and the technique could be extended to include amplification in the arms of the interferometer.

Path to AWAKE: Evolution of the concept


A Caldwell, E Adli, L Amorim, R Apsimon, T Argyropoulos, R Assmann, A-M Bachmann, E Batsch, J Bauche, VKB Olsen, M Bernardini, R Bingham, B Biskup, T Bohl, C Bracco, PN Burrows, G Burt, B Buttenschoen, A Butterworth, M Cascella, S Chattopadhyay, E Chevallay, S Cipiccia, H Damerau, L Deacon, R Dirksen, S Doebert, U Dorda, E Eisen, J Farmer, S Fartoukh, V Fedosseev, E Feldbaumer, R Fiorito, R Fonseca, F Friebel, G Geschonke, B Goddard, AA Gorn, O Grulke, E Gschwendtner, J Hansen, C Hessler, S Hillenbrand, W Hofle, J Holloway, C Huang, M Huether, D Jaroszynski, L Jensen, S Jolly, A Joulaei, M Kasim, F Keeble, R Kersevan, N Kumar, Y Li, S Liu, N Lopes, KV Lotov, W Lu, J Machacek, S Mandry, I Martin, R Martorelli, M Martyanov, S Mazzoni, M Meddahi, L Merminga, O Mete, VA Minakov, J Mitchell, J Moody, A-S Mueller, Z Najmudin, TCQ Noakes, P Norreys, J Osterhoff, E Oez, A Pardons, K Pepitone, A Petrenko, G Plyushchev, J Pozimski, A Pukhov, O Reimann, K Rieger, S Roesler, H Ruhl, T Rusnak, E Salveter, N Savard, J Schmidt, H von der Schmitt, A Seryi, E Shaposhnikova, ZM Sheng, R Sherwood, L Silva, F Simon, L Soby, AP Sosedkin, RI Spitsyn, T Tajima, R Tarkeshian, H Timko, R Trines, T Tueckmantel, PV Tuev, M Turner, E Velotti, V Verzilov, J Vieira, H Vincke, Y Wei, CP Welsch, M Wing, G Xia, V Yakimenko, H Zhang, F Zimmermann